Japan's attempt to reinsert a U.N. call for world leaders to visit Hiroshima and Nagasaki into the Nuclear Non-Proliferation Treaty has fizzled, dealing a blow to Tokyo, which dispatched a top diplomat to New York to press the matter after Beijing got it removed from the draft.

The two cities were destroyed by atomic bombs during World War II.

With the NPT review conference wrapping up on Friday, the Japanese delegation made another try by informally proposing that the final document include an invitation to "the atomic bombed areas," without naming either city, a diplomat said.